Liner remover



April 10, 1956 w. o. WEAVER LINER REMOVER 2 Sheets-Sheet l Filed Sept.7. 1951 s INVENToR. WC1/lace* O.. Weaver. B

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April 10, 1956 w. o. WEAVER LINER REMOVER 2 Sheets-Sheet 2 Filed sept.7, 1951 Q 3 N i* Q www ' INVENTOR. Wal/ace O. Wem/er. BY MMW/mmw A'T'TORNE YS.

United States Patent iiice 2,741,022 LINER REMovER Wallace O. Weaver,Enid, Okla. Application september 1, 1951, serial No.245,525 s claims.(ci. 279-244) This invention relates to a toolfor removing liners fromthe cylinders of pumps and the like, for example, mud pumps used incirculating drilling iluid inthe rotary drilling of wells and whichincludes a cylinder'having a removable liner in which a pistonisreciprocatedunder action of a cross head that is connected with thepiston through a piston rod. The liners of such pumps are subject towear and abrasion so that it is necessary to remove the worn Vliners andreplace them with new liners `to maintain the eiliciency of the pump.Such linersv are pressed tightly within the pump cylinders and whenthepumps have been in use for considerable time, the condition of thelinersmakes their removaldiflicult;

It is therefore the principal object'of the present invention to providea tool for removing such liners'and which permits use of the pump poweras the activating force in effecting removal of the liners.

Other objects of the invention are to* provide a tool wherein the pumppower may be supplemented .by the force of a jack which forms a part ofthe tool, and to provide a'tool for removing liners that is' easilyapplied to the pump and readily connected with the cross head thatnormally reciprocates the pump piston.

In accomplishing these and other objects of the invention hereinafterpointedout," I have provided improved structure, the preferred-form ofwhich is illustrated in the accompanying drawings, wherein:

Fig. 1 isa side elevational Viewy of a liner removing tool constructedinaccordance with thel presentinvention and showing the tool in positionwithin the pump, the pump being shown in longitudinal section.

Fig. 2 is an enlarged perspective viewy of the tool.

Fig. 3 is a side elevational view of the tool.

Fig, 4 is a fragmentary longitudinal section through the jaw portion ofthe tool illustrating operation of the sleeve to effect contraction ofthe jaws for facilitating removal of the tool from the liner of a pump.

Fig. 5 is a cross section through the tool on the line 5-5 of Fig. 3. Y

Fig. 6 is a perspective view of the bridge or cap member that is used inconnection with the'tool when it is desired tosupplement thepower of thepump actuator.

Referring more in detail to the drawings:

It is to be understood that the invention is adapted to the removal ofvarious type liners; the tool illustrated is described for removing'liners from a mud pump. Such pumps include a cylinder 1 closed at theouter end 2 by a removable head (not shown). The opposite end of thecylinder is closed by a head Shaving an axial'openingl 4 that slidablypasses. the piston rod (also not shown) of the pump. Connected with thehead 3 is a plate 5 which nor inally carries the usual stuffing boxantiv junk rings required in electing a seal about the piston rod.Connected with the pump cylinder through a frame 6 is a crank case 7enclosing an eccentric or crank 8, which in the type of pump.illustrated, is. actuated by a gear 9 which meshes with a drive piniongear 10fthat is adapted to beconnected A2,741,022 Patented Apr. 10, 1956with a prime mover or other actuator (not shown). Con-Y nected with theeccentric 8'is a pitman 11 having a wrist pin connection 12 with thecross head 13, the cross head being mounted in a suitable guide 14 andprovided with an internally threaded axial bore or socket 15 with whichthe end of the piston rod is connected` Pressed within a bore 16 of thepump cylinder is a liner or sleeve 17. The liner or sleeve 17 containsthe usual piston (not shown) by which the drilling fluid is drawnintoand discharged from the respective ends of the cylinder.

The liner is thus mounted so that it may be removed when worn andreplaced with a new` liner. However,

after such liners have been in use for some time, they be- Y comediiiicult to remove.

The present invention pertains to a tool for facilitating removal ofsuch liners under power eifected through the cross head of the pump. Thetool includes'an elongated rod assembly 18 composed of a push rodsection 19`having a threaded end 20 conforming with the threaded socket15 of the cross head and which is provided with a jamb nut 21 that ismounted on the threads for a purpose later described.

The rod section 19 preferably conforms with the diameter of the pistonrod of the pump so that it is Vadapted to be slidably supported in aguide and stuffing box 22 closing the opening in the casing 7 throughwhich the pistonV rod extends.

The tool also includesa rod section 23 that is connected with the rodsection 19 by means of acoupling 24, the adjacent ends 25 and 26 of therod sections being snugly engaged within sockets 27 and 2S that areprovided in the ends of the coupling, as best shown4 in Fig. 3. section23 has a cylindrical'cross section so as to be slidably supported withinthe opening l of the pumpcylinder,

head 3, as later described. The rod section 23 has a body portion 29intermediate the ends thereof that is preferably of square cross-sectionto provide substantially flat sides Sil-31 and StZ-3S. Attached to thesides 32-33 are transverse straps 34 and 35 having oppositely projectingends 36 and 37 which are provided with openings and 39 (Fig. 2).Supported in the openings, are pivot pins 4i) and 41 to pivotally mountjaws 42and 43 respectively for engaging the end of the liner.

The jaws have forwardly projecting cam or latch por tions 4d and 45which have their outer edges curving-forwardly and inwardly towardv theaxisof the rod member for a purpose later described. The opposite endsof the jaws have tail portions 45 and 47 carrying transverse pins 43 and49 that are suitably attached thereto as, for eX- ample, by welding.,The ends of the pins project beyond the sides of the jaws and areinterconnected by coil-springs i Si? which normally retain the camportions of the jaws in spread-apart position land with the tailportionsiu abutting contact with the upper and lower side faces 3b and31 of the portion 29 of the rod. The jaws also have transverse shoulders5l and 52` which project outwardly thereof between the cam ends andthepivot pins for engaging the.v

The pivot pins 4Z and 43 areend of the pump liner. retained by cotterpins 53 that extend through openings in the ends of they pivot pins atthe outer sides of the mounting straps 3d and 35.

The rod section 23 carries a jaw contracting device 54,

which has a tubular body 55 slidably mounted on the rod member betweenthe end of the square portion 2% and aV stop ring 5'6, the stop ringbeing engaged Within an annular groove 57 of the rod member, as bestshown in Fig. 3.

The end of the sleeve adjacent the jaws includes a head 5 having aninwardly tapering socket 59 that is adapted to engage the cam portionsof the jaws when the sleeve memberismoved into engagement therewith asshown in The rod Fig. 4 so as to contract the jaws by rocking theminwardly on their pivot pins as later described.

The outer end of the rod member 23 is externally threaded as indicatedat 66 to form a jack screw which mounts a cupshape bridge or abutmentmember 61 and a draw nut 62. The member 61 has a disc-shape end 63provided with an opening 64 for passing the threaded end of the rod andthe periphery thereof is provided with a laterally extending annularilange 65 adapted to engage the outer end of the pump cylinder when thejack screw portion of the tool is needed to supplement the power exertedthrough the cross head.

Assuming that the liner 17 is to be removed with a tool constructed asdescribed, the packing glands, packing and junk rings are removed fromthe pump along with the pump head which closes the outer end 2 of thepump cylinder. With the cross head 13 on the complete back stroke of theeccentric 8 the push rod section 19 of the tool, without the nut 21thereon, is inserted through the stuffing box 22 until the threaded end2i) of the rod section 19 appears through a service opening 7' in thetop of the crank case. The jamb nut 2.1 is then inserted through theservice opening 7 and is turned onto the threaded end 20. After the jambnut 21 has been applied, the rod 19 is pushed on through the stuing boxuntil the threaded end 2d is in position to enter the threaded socket 15of the cross head. The rod section 19 is then turned into the threadedsocketl 15 of the cross head, after which the jamb nut 21 is tightenedagainst the cross head to complete the connection. The couplingr 24 isthen slipped over the end 25 of the push rod 19, as shown in Fig. 3. Therod section 23 is then passed through the open end 2 of the cylinder 1,liner 17, and opening 4 of the stui box plate so that the end 26 thereofengages in the socket 2S of the coupling 24.

During insertion of the rod section 23, the jaws 42 and 43 pivotinwardly against action of their springs Si). However, when the jawsissue from the inner end of the liner, the springs Sti snap the jawoutwardly into open position so that the shoulders 51 and 52 thereof arein position to engage the end of the liner, as shown in Fig. l. When thetool is in this position the rod sections are slidably supported withinthe openings of the respective stuffing boxes to hold the tool in theaxis of the liner.

To remove the liner power will be applied through the cross head 13under control of the usual lever operated clutch (not shown). Uponengagement of the clutch the pinion will rotate to effect turning of thelarger gear 9 to cause the eccentric to push the pitman 11 and crosshead 13 forwardly in the guide 14 of the pump so as to exert pushingforce on the end of the liner through the jaws 42 and 43. This force isordinarily suicient to free the liner and push it out of the bore 16,but should the liner be more difficult to remove the bridge or capmember 61 may be applied over the threaded end 60 of the rod section 23followed by the draw nut 62 so that the flange 65 is moved intoengagement with the end 2 of the pump cylinder. ri`hen when the nut 62is drawn up against the cap or bridge 61, a pull is effected on the rodin an axial direction and against the end of the cylinder to give thesufficient additional power simultaneously with the power through thecross head to assure loosening of the liner within the cylinder. It willbe understood that as the draw nut 62 is tightened the power on thecross head, tending to move the cross head in the guide 14, will keepthe end 2S against the bottom of the socket 27 of the sleeve and thebottom of the socket 2S against the end 26 of the rod section 23 so thatthe pushing force of the jaws on the liner will continue to functionwhen the pulling force is applied through the draw nut 62. Thus, pushingaud pulling forces are simultaneously applied to the cylinder liner toaffect removal in diilicult cases.

To remove the tool from the liner when the liner is in the pump, theclutch should be disengaged to release `pressure on the push rod section19. The pump is then 4 turned back until the shoulders 51 and 52 on thejaws 42 and 43 are free from the ends of the cylinder. The jawcontracting sleeve is then moved inwardly over the outer end of the rodsection 23 so that the tapered socket 45 thereof engages the camportions 44 and 45 of the jaws to cause the jaws to swing inwardlytoward the rod section and permit the shoulders S1 and 52 of the jaws toclear the inner circumference of the liner when the rod section 23 iswithdrawn from the open end of the cylinder.

After removal of the liner the section of the tool is withdrawn from thecylinder of the pump with the end slipping out of the socket 28 of thecoupling. The coupling is then removed from the rod section 19 and therod section is Unthreaded from the cross head.

Should the pump be mounted where the motor power cannot be used, thetool may be operated without the use of the push rod section 19. In thisinstance, the rod section 23 is inserted through the open end 2 of thecylinder 1 until the shoulders 51 and 52 of the jaws 42 and 43 pass theinner end of the liner whereupon the jaws spring outwardly. The member61 is then placed over the threaded end of the rod 63 to engage the openend of the pump cylinder, after which the draw nut 62 is tightened upagainst the member 61 to exert the force necessary for loosening theliner and pulling the liner from the bore 16 of the pump cylinder.

It is obvious that the same tool may be used for liners of various sizeby changing the puller jaws 42 and 43. This is readily effected byremoving the pivot pins 4t) and 41 and unhooking the spring 56. Propersize jaws are then inserted between the ends 36 and 37 after which thepins and 41 are reinserted. The springs are then engaged with the tailportions of the jaws to complete the change. It is obvious that by useof my improved tool, removal of pump liners is much casier and fasterthereby saving time and labor.

What is claimed is:

l. A device for removing a liner from the cylinder of a pump or the likeutilizing power from the cross head of the pump, said device including apush rod having an end adapted for connection with the cross head, acoupling engaging the other end of the push rod, a rod engaged with thecoupling and adapted to extend axially through the liner, jaws pivotallymounted on said last named rod and having portions adapted to engage anend of the liner, a spring for expanding the jaws to elect saidengagement with the liner, and a jaw contracter slidable upon said lastnamed rod and engageable with the jaws to eifect contraction of the jawsagainst action of the spring to permit retractive movement of the jawsthrough the liner in case the device must be withdrawn through theliner.

2. A device for removing a liner from the cylinder of a pump wherein thepump includes a cross head having a connection for a piston rod andpowered by an actuator for the pump for reciprocatory movement of thecross head in alignment with the stuffing box of the pump cylinder inwhich a liner is slidably contained, said device including a pair of rodsections, one of the rod sections having means on an end thereof forconnection with the rod connection of the cross head, jaws on the otherrod section and adapted to engage an end of the liner immediatelyadjacent the said stutiing box when the rod member is inserted throughthe liner and projected through the opening of the stung box forabutment with said one rod section, and a coupling for said registeringends of the rod sections to support the rod sections in abuttingalignment and elect movement of the liner from said cylinder uponactuation of the cross head.

3. A device for removing a liner from the cylinder of a pump wherein thepump includes a cross head, having a connection for a piston rod andpowered by an actuator of the pump for reciprocatory movement inalignment with the stuing box of the pump cylinder in which a liner isslidably contained, said device including a pair n.4 sin of rodsections, one of the rod sections having means on an end thereof forconnection with the rod connec tion of the cross head, jaws pivotallymounted on the other rod section and having cam portions, springs;normally spreading the jaws apart for engagement with an end of theliner immediately adjacent the said stuffing4 box when the rod member isinserted through the liner from the end opposite the stufng box, acoupling for the ends of the rod sections to support the rod sections inabutting alignment and effect movement of the liner 10 from saidcylinder upon actuation of the cross head, and a sleeve member slidableon the said other rod section and having means for engaging said camportions to move the jaws out of engagement with said end of the liner.

References Cited in the file of this patent UNITED STATES PATENTS

